Submitted to: Los Alamos National Laboratory Series
Publication Type: Government Publication
Publication Acceptance Date: 10/30/1994
Publication Date: N/A
Technical Abstract: A prototype decision support system (PDSS) using multi-objective decision theory and embedded simulation models is being developed to evaluate trench cap designs for mixed waste landfills. To evaluate the performance of the PDSS, the simulation models, which are used to parameterize the decision model when data are not available were calibrated and tested using data from a four year study of landfill cover performance at Hill Air Force Base. The two linked simulation models are the HELP (Hydrologic Evaluation of Landfill Performance) and CREAMS (Chemicals, Runoff, and Erosion from Agricultural Management Systems) models. The models were calibrated using water balance and erosion parameters for two alternative designs, a control soil cover and a modified EPA RCRA design. Simulations were run using the calibrated model parameters for a two hundred year period to test the long-term stability of the models. The largest variance from the long-term mean was for runoff and sediment yield. The results of the calibration and long-term test were reasonable for the length of the Hill Air Force Base data set. The decision variables were parameterized using the results from the calibrated model and run through the decision model. The results of the decision model for the simulation models were similar with to the results for the field data with an increase in the variance.